Drive pin assembly for the cutter block of an electric razor



Aug. 26, 1969 K. BAUMANN I 3,462,833

' DRIVE FIN ASSEMBLY FOR THE CUTTER BLOCK OF AN ELECTRIC RAZOR Original Filed June 9. '1966 PRESS/N6 UPW VAPOL. V Mg? aiocx F76. I /9 OPEEflT/l/EL cON VEO TED CUTTER OCK lNO'ER TED m/ro 4 25 p ror/A/e LEVER INVENTOR.

3,462,833 DRIVE Pm ASSEMBLY FOR THE CUTTER BLOCK OF AN ELECTRIC RAZOR Kurt Baumann, Solingen-Merscheid, Germany, assignor to Robert Krups, Solingen-Wald, Germany, a corporation of Germany Original application June 9, 1966, Ser. No. 556,510, now Patent No. 3,389,467, dated June 25, 1968. Divided and this application Jan. 19, 1968, Ser. No. 699,230 Claims priority, application Germany, June 10, 1965, K 56,343 Int. Cl. 1326b 19/38 US. Cl. 3043.92 2 Claims ABSTRACT OF THE DISCLOSURE A swinging lever for reciprocation of a cutter block of a shearing head for dry electric razors, which comprises a sleeve defining a receiving chamber, and a bolt reciprocating in the sleeve. A spring is disposed in the sleeve and charges the bolt. One end of the spring is supported by the cutter block, and the sleeve is adapted for releasable connection with the cutter block and the sleeve includes an abutment means for limiting the displacement of the bolt.

This is a divisional application of the copending application, Ser. No. 55 6,5 10, filed June 9, 1966, which has matured into Patent No. 3,389,467, granted June 25, 1968.

The present invention relates to a. cutter drive member for reciprocation of the cutter block of a shearing head for electric razors with a sleeve and a shaft reciprocating in the sleeve, which shaft is arranged under the load of a spring disposed in the sleeve and the end of the spring pointing to the sleeve supports itself on the cutter block.

The known cutter drive members of the mentioned type have appreciable drawbacks. For the securing of the known sleeves, a particular structural part is provided, namely an angular member. The angular member is arranged thereby with one leg member parallel to a blade spring, while its other member disposed perpendicularly to the first-mentioned member carries the sleeve. A limitation of the movement of the shaft within the sleeve is not provided. Thus, particular measures have to be taken on the cutter head, in order to prevent an undesired escape of the shaft being under the force of the spring. Nose members provided on the cutter block serve this purpose. If these nose members were not provided, then the spring would push the shaft out and thereby the cutter block. By this arrangement, a complete removal of the shaft out of the sleeve would be possible.

It is one object of the present invention to provide a cutter drive member for the cutter block of an electric dry razor which avoids the drawback set forth above.

It is another object of the present invention to provide a cutter drive member for the cutter block of an electric dry razor, wherein the sleeve is adapted to be connected with the cutter block by means of a simple connection and has an abutment member for limiting the displacing of a bolt constituting the shaft. Thus, the part consisting of a sleeve, shaft and spring can be prefabricated as complete structural unit and be releasably connected in a simple manner with the cutter block. Upon the occurrence of damage, this structural unit can easily and quickly be replaced by a new one. In spite of the fact that the bolt stays under the load of the spring disposed in the sleeve, the removal of the bolt from the sleeve is limited by the arrangement of the mentioned abutment inside of the sleeve. The compact structural unit remains, thus, also complete as a unit, even if it is removed from the shear United States Patent ing head without being taken apart into its elements, as it occurs in known structures. By this arrangement, particu lar measures are not required, as for instance, the arrangement of nose members on the cutter head which is much more cumbersome and inconvenient to produce.

Furthermore, in the present invention the spring is completely inside of the sleeve, while in the known structures one end of the spring projects from the lower end of the sleeve and is hooked into an eye of a particular body.

It is still another object of the present invention to provide a cutter driver member for the cutter block for an electric dry razor, wherein one part of the connection to the cutter block can be formed by parts of the sleeve, namely in simple manner such, that outwardly directed angular arrangements are provided through which the strips of the connection are created. By means of these strips, 21 fast and simple connection with. the cutter block can take place. The complementary counterpart of the connection is coordinated to the cutter block. By simple inserting and following a subsequent short rotation, this connection can be transformed into its operative position.

It is further advisable in accordance with the present invention to equip the bolt with a reduced diameter shaft portion, which is surrounded by the charging spring constituting a helical spring. By this arrangement, a bending of the spring is rendered impossible.

It can also be arranged in accordance with the present invention that the sleeve is surrounded by an additional outer sleeve in order to fortify the former sleeve of the structural unit.

It is further desirable to provide the structural unit with a bottom member which is connected with the sleeve and which serves as the support of the spring. By this arrangement, suitably the bottom is of pot-shape and equipped with an outwardly directed collar, as well as connected with the sleeve by means of a bead arrangement. While the bead arrangement of the connection serves the connection of the bottom with the sleeve, a collar thereof serves as a supporting face and abutment for the outer sleeve in case such outer sleeve is provided. Furthermore, this collar can be used for a simple releasable connection of the drive pin on the pivoting lever.

With these and other objects in view, which will become apparent in the following detailed description, the present invention will be clearly understood in connection with the accompanying drawings, in which:

FIGURE 1 is an elevation of a drive pin of the present invention, partly in section, and shown at a greatly enlarged scale, in its position separated from the shearing head of the razor;

FIG. 2 is a top plan view of the drive pin of FIG. 1; and

FIG. 3 is an elevation, partly in section, of the bottom of the drive pin disclosed in FIGS. 1 and 2, yet prior to its final forming.

Referring now to the drawing, the shearing head comprises a drive pin 10, which consists of a sleeve 11, which has at first openings at both ends, which openings, however are closed subsequently in a manner which will be described below. The greatest part of the chamber formed by the sleeve 11 represents a receiving chamber 18 for a spring 12. The inner wall of the receiving chamber 18' forms simultaneously a guide face 27 for ranges of the movable part of the drive pin 16, which ranges will be indicated. At one end of the receiving chamber 18, an annular shoulder 22 is formed to be followed in the direction towards the upper end of the sleeve 11, by a hollow cylinder 17, which has, however, a smaller diameter, than that of the receiving chamber 18. The inner walls of the hollow cylinder serve also as guide faces 28.

The sleeve 11 has integral therewith outwardly directed connecting members 15. In this embodiment, as can be ascertained from FIG. 2, the connecting members 15 are angularly bent tongues which form the one part of a bayonet lock, whereby the complementary other part is associated with a cutter block for operational connection therewith as indicated.

In the shown embodiment, the sleeve 11 is also surrounded by an outer sleeve 23. The latter has within the range of one of its end faces groove-like recesses 16, which recesses 16 receive parts of the tongue-like connecting members 15. As disclosed in FIGS. 1 and 2, the tongue-like connecting members 15 are made of a length, that they extend beyond the outer wall of the outer sleeve 23. Otherwise, the tongue-like connecting memberslS are of identical shape relative to each other and are disposed on diametrically opposite sides of the sleeve 11. The upper end faces of the sleeve 11 and of the outer sleeve 23 are in the same plane.

A longitudinally displaceable bolt 13 of the drive pin consists of an integral bolt, which, however, is divided up into a plurality of different ranges. Its upper end comprises a cylindrical ram 19 which projects from the sleeve 11, as disclosed in FIG. 1, and the protruding free end of the bolt 13 is of semi-spherical shape. Ranges of the outer wall of the cylindrical ram 19 cooperate with the guide faces 28 of the sleeve 11. Adjoining the cylindrical ram 19 is a flange 20, which is, however, of a larger diameter than that of the cylindrical ram 19. The flange 20 cooperates with the shoulder 22 within the range of the inner wall of the sleeve 11. This shoulder 22 forms a limiting abutment for the displacement of the bolt 13 in the sleeve 11. FIG. 1 shows this position. Upon the action of an axial downwardly directed force, the bolt 13 is pushed downwardly cocking the spring 12.

The cylindical outer face of the flange 20 cooperates with the guide surface 27 on the inner wall of the sleeve 11. Adjoining the flange 20 is a shaft portion 21 of the bolt 13 which is of a smaller diameter than that of the flange 20 and of the ram 19, respectively. The shaft portion 21, as shown in FIG. 1, is surrounded by the spring 12, designed as a coil spring. This is readily possible, because the diameter of the shaft portion 21 is appreciably smaller than the diameter of the receiving chamber 18 for the spring 12. One end of the spring 12 rests against one end face of the flange 20, while the opposite end of the spring 12 rests against the inner wall of a pot-shaped bottom 14.

The design of the pot-shaped bottom 14 is best denoted in FIGS. 1 and 3. FIG. 3 discloses the shape of the potshaped bottom 14, prior to its application to the sleeve 11. Accordingly, the pot-shaped bottom 14 has a circular collar 24 which is directed outwardly. One end face of the outer sleeve 23 can rest on the collar 24, as shown in FIG. 1. The connection between the bottom 14 and the sleeve 11 is obtained by a circumferential groove 26 provided on the outer wall of the sleeve 11, into which are pressed parts of the side wall of the bottom 14, i.e., such that after performing the connection, a corrugation 25 is created.

Upon application of the bottom 14, the drive pin of the cutter drive member forms a structural unit, which can be inserted, as indicated, as a unit into a pivoting lever of an electric razor. This means that the drive pin is first of all completely pre-assembled and the thus created structural unit is then subsequently inserted into the pivoting lever.

In operation, the drive pin unit is inserted into a pivoting lever (not shown), the latter angularly reciprocating about its axis by an electric motor (not shown). The drive pin 10 jointly reciprocates angularly with the pivoting lever and serves as an intermediate transmitting member for reciprocatingly driving the cutter block and the associated cutters therewith. For this purpose the connecting members are operatively connected to the cutter block, similar to that disclosed in my previously mentioned co-pending divisional patent application, Ser. No. 556,510, now Patent No. 3,389,467, pivotally (paral- 4 lel to the axis of the pivoting lever) and vertically displaceably theretogether, although not limited thereto. The cylindrical ram 19 of the bolt 13 operatively presses the cutter block upwardly, insuring that the cutter blades are always suitably against a perforated shearing comb sheet (not shown) during shaving. This is accomplished by the spring 18, being a compression spring, always urging the bolt 13 upwardly by pressing on flange 20. The above mentioned members which are not shown are conventional.

While I have disclosed one embodiment of the present invention, it is to be understod that this embodiment is given by example only and not in a limiting sense, the scope of the present invention being determined by the objects and the claims.

I claim: 1. A drive pin for reciprocation of a cutter block of a shearing head for dry electric razors, comprising a sleeve defining an interior chamber having at least two cylindrical guide faces of different diameters, and an annular abutment surface therebetween facing downwardly and separating one of said cylindrical guide faces having a smaller diameter thereabove from another of said cylindrical guide faces having a larger diameter therebelow,

bolt means reciprocating in said sleeve and having a cylindrical ram portion guided in said one of said cylindrical guide faces and a diameter substantially complementary thereto and extending at the top beyond said sleeve and adapted thereat to operatively press on a cutter block,

said bolt means including an outwardly directed flange portion at the bottom of said ram portion of a diameter substantially equal to that of said other of said cylindrical guide faces and guided therein,

said bolt means including a cylindrical shaft portion disposed in said other of said cylindrical guide faces and of a diameter smaller than that of the latter and having a lower end spaced from the lower end of said sleeve,

a compression spring disposed in said sleeve about said shaft portion of said bolt means,

one end of said spring being pressed against the bottom face of said flange, a bottom member secured to the lower end of said sleeve and supporting the other end of said spring,

said sleeve including connection means for operatively releasably securing said sleeve with said cutter block, and

said flange abutting in its uppermost position said annular abutment surface for limiting the displacement of said bolt means in upward direction.

2. The drive pin, as set forth in claim 1, wherein said sleeve includes outwardly directed tongue members at its top, constituting said connection means and comprising one part of a bayonet lock, and

said bottom member includes an outwardly directed annular collar,

an outer sleeve complementarily disposed about said sleeve and supported on said annular collar,

said outer sleeve is formed with recesses at its top through which said tongue members complementarily extend, and

said tops of both sleeves lie in the same plane.

References Cited UNITED STATES PATENTS 2,133,665 10/1938 Leigh 30'-43.6 2,242,752 5/1941 Meyer 3043.6 2,245,420 6/1941 Volz 3043.6 2,282,539 5/1942 Bahr 3043.6 3,242,569 3/1966 Van Der Driest 3043.5 MYRON C. KRUSE, Primary Examiner US. Cl. X.R. 3090 

